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2,645 results on '"Turner, Matthew"'

218. Modified model reference adaptive observer‐based control without assumptions on uncertain parameter bounds.

Author

Faramin, Mostafa and Turner, Matthew C.

Subjects
*ADAPTIVE control systems, *CLOSED loop systems, *PARAMETER estimation, *LINEAR matrix inequalities, *MATRIX inequalities
Abstract

This paper proposes a Modified model reference adaptive controller and observer (MMRACO) for unknown linear time‐invariant (LTI) systems. The recent literature, and in particular the so‐called MRACO approach, has demonstrated how some deficiencies in standard model reference adaptive control can be overcome by using a combination of modified reference models and observers, but this is done at the expense of knowing bounds on certain unknown parameters. Here, a novel adaptive observer/controller combination is presented which removes the need to know the above bounds but preserves the other desirable features of the MRACO approach. A Lyapunov analysis of the closed‐loop system ensures asymptotic convergence of both tracking and observer errors, with uniform boundedness of parameter estimation errors. A key advantage of the scheme is that the design involves only solutions of two Lyapunov equations (or linear matrix inequalities) and does not require the selection of a "high gain" parameter. The effectiveness of the approach is illustrated in some numerical examples. [ABSTRACT FROM AUTHOR]

Published
2024
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229. Robust control of systems subject to input non-linearities with application to high performance helicopters

Author

Turner, Matthew Christopher

Subjects
629.8, Control systems & control theory
Abstract

This thesis addresses some of the issues associated with linear systems subject to nonlinearities at their input, and considers robust control of high performance helicopters. In particular, the problems of substitution and saturation nonlinearities are discussed. In the case of the former, a new procedure based on ideas from optimal control is developed to help facilitate dynamic transfer between two linear controllers. For the latter, a generalisation of an existing scheme is made which allows asymptotic set-point tracking for all states belonging to a given subset of the state space. The closely related problem of limited authority control is considered and promising results are demonstrated on the Westland Lynx helicopter in a pilotted simulation. The thesis culminates with a discussion of the design and implementation of an Hinfinity controller for the Bell 205 helicopter. The results show that in flight, the helicopter attained good handling qualities ratings, even though the fidelity of some of the mathematical models was relatively low.

Published
2000

236. Local Government Behavior and Property Rights Formation in Rural China

Author

Brandt, Loren, Rozelle, Scott D., and Turner, Matthew A.

Subjects
devolution of land rights, evolution of tenure security, local government behavior
Abstract

We examine the ongoing transition from centrally planned to market agriculture in rural China. In particular, we examine the devolution of land rights from village governments to villagers and the corresponding evolution of tenure security in agricultural land. We find econometric support for the statistical and economic importance of four explanations for local government behavior. Three of these explanations indicate a link between the incentives and constraints faced by village leaders and property rights in agricultural land, and hence suggest policy levers to encourage more secure property rights.

Published
2002

238. NeuroBridge: a prototype platform for discovery of the long-tail neuroimaging data

Author

Wang, Lei, primary, Ambite, José Luis, additional, Appaji, Abhishek, additional, Bijsterbosch, Janine, additional, Dockes, Jerome, additional, Herrick, Rick, additional, Kogan, Alex, additional, Lander, Howard, additional, Marcus, Daniel, additional, Moore, Stephen M., additional, Poline, Jean-Baptiste, additional, Rajasekar, Arcot, additional, Sahoo, Satya S., additional, Turner, Matthew D., additional, Wang, Xiaochen, additional, Wang, Yue, additional, and Turner, Jessica A., additional

Published
2023
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